We've just released a new version of the OpenCart connector for MobiCart which you can find below. The new connector will not only import all your products, it will also push back orders from MobiCart to OpenCart.

I have an one more method. Contus M Comm Solution - It is readily built for opencart mobile app & 100% Customizable. You can modified or update whatever you want. It is comes along with features like deep linking, push notification, location targeting, multi language, payment integration etc. This API can integrate you mobile app & sync instantly. Just visit here http://www.contus.com/opencart-mobile-app.php